I find it a bit too quiet so I want more sound and have been looking at all the aftermarket X-pipes from: Akra, GTM, Supersprint, Dinan, etc....

Is the primary difference just the removal of the resonators? Reason I ask is I have access to a very capable muffler shop so I was thinking to just let them modify my OEM X-pipe...has anyone else done this?

Pros / Cons?

I was looking for pictures of stock X-pipe vs. the aftermarket but haven't found many on here.

I find it a bit too quiet so I want more sound and have been looking at all the aftermarket X-pipes from: Akra, GTM, Supersprint, Dinan, etc....

Is the primary difference just the removal of the resonators? Reason I ask is I have access to a very capable muffler shop so I was thinking to just let them modify my OEM X-pipe...has anyone else done this?

Pros / Cons?

I was looking for pictures of stock X-pipe vs. the aftermarket but haven't found many on here.

I find it a bit too quiet so I want more sound and have been looking at all the aftermarket X-pipes from: Akra, GTM, Supersprint, Dinan, etc....

Is the primary difference just the removal of the resonators? Reason I ask is I have access to a very capable muffler shop so I was thinking to just let them modify my OEM X-pipe...has anyone else done this?

Pros / Cons?

I was looking for pictures of stock X-pipe vs. the aftermarket but haven't found many on here.

thanks!

IND has a good picture of the differences using Challenge as an example:

As an alternative option, Bypass Track Pipes are a good inexpensive way to rid of the restrictive primary cats at a fraction of the cost of an X-Pipe.

You need to have adapters for the slip-on to attach to a stock exhaust type flange.

The stock X-pipe also has lots of kinks and bends in it compared to an aftermarket pipe. It probably doesn't really matter but there is a difference.

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Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."

Where to find such adapters. I have the evo and I want to switch out my xpipe

They came with the EVO. I'm not sure if they were in the X-pipe box or slip on box. I saved mine and I'm glad I did since I'm considering swapping out the X-pipe too. I'm super sensitive to smell and it's a little more than I want with the 100cpi cats. I think I'd be pretty happy with 200 cpi cats.

For the OP. You won't gain much by deleting the secondary cats. Evolve did pressure studies and didn't gain much by deleting the secondary cats. You may gain some sound by getting rid of them, but I'm thinking you need to switch the rear section to something more aggressive sounding. The Akra just doesn't have that V8 snarl, but I keep it since it's very livable.

__________________

Let me get this straight... You are swapping out parts designed by some of the top engineers in the world because some guys sponsored by a company told you it's "better??" But when you ask the same guy about tracking, "oh no, I have a kid now" or "I just detailed my car." or "i just got new tires."

They came with the EVO. I'm not sure if they were in the X-pipe box or slip on box. I saved mine and I'm glad I did since I'm considering swapping out the X-pipe too. I'm super sensitive to smell and it's a little more than I want with the 100cpi cats. I think I'd be pretty happy with 200 cpi cats.

For the OP. You won't gain much by deleting the secondary cats. Evolve did pressure studies and didn't gain much by deleting the secondary cats. You may gain some sound by getting rid of them, but I'm thinking you need to switch the rear section to something more aggressive sounding. The Akra just doesn't have that V8 snarl, but I keep it since it's very livable.

The Street pipe retains the OEM Primary cats, you still get a CEL unless a tune is added.

Any of the pictured x-pipes will mate to the Akrapovic Slip-On.

Are you sure you get a CEL if you get the street pipe? i bought it from a member that claimed it wouldnt give me a CEL and he used it for 20k miles.
I just installed it last week and so far no CEL
Im talking about the pipe that leaves the primaries but removes the secondary cats

Are you sure you get a CEL if you get the street pipe? i bought it from a member that claimed it wouldnt give me a CEL and he used it for 20k miles.
I just installed it last week and so far no CEL
Im talking about the pipe that leaves the primaries but removes the secondary cats

As an authorized dealer for Challenge, we are proud to announce that Challenge have just recently released new line of X Pipes, which will be the new standard in workmanship and performance for your e9x M3.

Street - OEM Catalysts
The Challenge Street X Pipe features 304 stainless steel piping and flanges, twin high flow resonators, and a precision fabricated X section. This pipe slip fits after your OEM cats, for easy installation with NO check engine lights! Best of all, no exhaust smell to alert the law at inspection. All bolts, gaskets, and stainless clamps necessary for install are included.

both Challenge and FabSpeed claim no CEL! I dont think they could advertise that if it wasnt true?
Im worried now... The only reason i got the street x-pipe was to avoid getting a CEL
Anyone running a street pipe that got a CEL?

If you plan to cut your OEM pipes, consider spending the extra cash and getting a whole new mid section. When it comes times to smog (if relevant) having an intact OEM xpipe with cats can be very helpful unless you know a smog shop owner very well.

If cost is a concern, you can just get test pipes from ACM or Turner for $400 which will extract most of the power from the exhaust. Of course this will also require modifying your stock pipe and will require welding to go back to stock. Another option is to get one of the ebay x-pipes, they may not be as high quality as the others, but fitment is usually pretty good. Here is one for $450 shipped made by topspeed: http://www.ebay.com/itm/BMW-E92-E93-...ht_2542wt_1013

I had topspeed test pipes on my 350z and they worked great for several years. Resonators can be added on if its too raspy.

If money is no option, I see no reason not to go with the akra x pipe or a quad resonated setup like borla or dinan.